the head of security told us the alleged shooter check in with security upon entering the hospital at 11:00 today, and like any other visitor, received eight visitors wristband. only high-risk patients and visitors are screened. high-risk peak -- people are those the hospital no could pose a risk to others. johns hopkins does not have metal detectors at any entrance. >> we have over 80 doors, loading docks, emergency exits to these campus buildings. to put a magnetometer at 80 , and the required armed forced that would need to be staffing the magnetometers, is not realistic. >> the head of security also told us that as far as he knows, there are only one or two hospitals in the country that have metal detectors. as far as we have been told, officials are not sure which entranced mr. davis went into. they are in the process of checking surveillance video to see if they can make a timeline and actually map out this whole situation. we are told that the hospital will review and evaluate its visitor screening policies and its overall security procedures. >> you can keep up with the storie